Typewriting machine



Ill

Paton Get. 31, 1922.

JQliill' WW, 0? E'I'H, NEW JERSEY, AS SIGNOB T0 UHDEBWQQD m2,

W comet ry, or new renn, n. it, n oonrons'rron or EW'BETHG'Q- m CREME.

Application. filed Eecemher 1?, 19%. Serial No. 3%,hl5.

To aZ-Z whom is may concern:

Be it @own that l', Jorrn a citizen of the llnitetl Stet-es, residing 1n 'Elizeheth, in the county of Union end Stete of New Jersey, have inventecl certain new entl nsefnl Improvements in Type-writing Machines, of which the following is e specificetion,

This invention relates to typewriting mechines, end more particularly to mechanism for varying the position. of the platen with respect to the printing point so as to cause more weer of the plsten end-thereby increase the life of the platen,

object of the present invention is to provide means whereby each release or castoff of the feed-rolls from the platen will sheet the shifting of the letter with refer ence to the printing point.

Another object of the invention is to pro vicle improved means whereby e fractions-l line-splice movement of the platen with reference to the line-space wheel may readily be elfecte,

According to the present invention, the platen is connected with its driving sheft by means or" difi'erentisl caring controlled by s sleeve on the shell. llorinelly, the dint :terentiol gearing end the sleeve rotate with said shaft, snfi the platen is rotated as it fined on the platen shaft. When, however, the iced-rolls are released or csstch" for insertion or" work-sheets, or any other purpose, the sleeve will he rototecl on the shaft snrl a reduced movement given to the platen.

,llrovision may elsohe mmle whereby the pleten will be shifted longitudinally hy the i eed-rollrelee'se mechanism. 7

.Frectionel line-space adjustment of th platen may he efiecterl by means of is fingerwheel fixed on the sleeve, which controls the (lificrentisl gearing.

Inasmuch as the feecl-roll-releose mechanism is nsuolly sctna to enable insertion of work-sheets, shifting of the platen, with snficient frequency, is insnrelend, at the same time, there will he no shifting during the typing of e single sheet, which would. alter either the linesspece positions, or the letter-space positions of the platen relative to the printing point.

Other features and advantages will hereinefter appear.

In the accompanying orewings,

Figure l is en end elevetion of e @leten heme, showing the connection between the ieed-roll-relesse device end the retchet wheel by means of which the differential gearing may he ectnetetl,

Figure 8 is s longitnilinel sectional view along the line 2-2 of Figure 3, showingthe arrangement of the on the in ternel gears.

Figure 3 is s longitnrlnel sectional view of the platen snil essocieteil nsrts.

The platen comprises e cylindrical sheeth l of suitable material, such as rnhher, monntealon e hollow core ll, oreterehlv of woocl, entl heads 3 encl secure e the core 2 by means of screws 5, the left-hand hesci being jonrnslecl on sheit 6, one right-howl heed I: heing jonrnelecl on sleeve 7, rotetehly monntecl on shef't 6-. will he seen that the left-hand heed 3 is nrovidled with s circnln-r flange 3 which fits the boreor" the hollow core 2..

in order to snpport the platen in the usual platen frame '8, the sheft 6 is jonrnslerl in the left-hand enfl of the platen flame encl in the sleeve 7, which, in turn, is jonrneleml in the right-hand end of the platen frame. Shaft 6 may he turned by melrns or e line-space or ratchet wheel 9, fired on the shaft .6 at the left of the platen, or by means of ger-wheels 10.

The ratchet wheel '9 may he yicltlsbly maintoineel in position by means of e detent roll 11 on n pivotslly mounted arm 12 nrgeci towerfi the ratchet or line-space wheel 9 hy a spring 13.

The means for actuating the ratchet wheel or line-space wheel 9 may he like that nsetl in the Underwood machine anal, in gcnerel, is the same as that shown in the patent to Alfred 'G. F. Knrowski, No. 1,190,658, granted Jnly ll, 1918, and the actuating means may he set for one, two or three line-- space movements by means of srega lstor lever 14 For the purpose or driving the platen from the shaft 6, an internal gear 15 is placed in a recess 15 in the right-hand entl of core 2. A hub 16, ext-enfling to the left (Figure 3} from said gear, projects into the core 2, which is provided with s hearing member 17 to prevent undue wear of sai -nall proportional core. The internal gear 15 is provided also with a hub 18 extending in the opposite direction to give a better bearing for the ar 15 on shaft 6. A spline or key 19 on s aft 6 engages in a slot or groove 20 in hub portions 16 and 18, thus providing means whereby the internal gear 15 will be rotated with shaft 6 and may be shifted longitudithereof.

T e head 4 of the platen is provided with an internal gear 21 of the same diameter as gear 15, but having a slightly larger number of teeth. It will be seen that the internal gear 21 will serve to maintain the internal gear 15 in the recess 15" of the core 2. A driving connection between gears 15 and 21 may be effected by means of a pinion 22 constantly in mesh with both of said gears. This pinion is supported on a stud 23 in an arm 24 carried by sleeve 7.

In line-spacing by means of the line-space wheel 9, sleeve 7 will turn with shaft 6 and pinion 22 will act merely as a connector between the two internal gears 15 and 21, which will rotate together, thereby effecting rotation of the platen accordance with the movement of the lingspace wheel.

The arrangement of the different parts is such that the frictional resistance to the turning of sleeve 7 is insuflicient to prevent movement thereof with the driving shaft. If, however, the sleeve 7 is rotated with reference to shaft 6, pinion 22 will be rotated by gear 15, which normally will be held against movement due to the engagement of detent roll 11 with the line space wheel, and, due to the difierence in the n ber of teeth between the internal gears, will shift gear 21 with reference to gear 15 a distance proportional to the number of teeth passed over. As seen in Figure 2, the pitch or distance between the teeth of gear 21 is less than on gear 15. Therefore, when p'inion 22 is moved to the right over one tooth of gear 15, the next notch of gear 21 will be brought into alignment with the next notch of gear 15, thus causing the former to be advanced a distance equal to the difference in pitch between the two intervals. Obviously, if pinion 22 is advanced further, the advanced movement of gear 21 will be to the number of teeth of gear 15 passed over by pinion 22. Movement of pinion 22 in the reverse direction will efiect a reverse movement of car 21.

The sleeve 7 may be held against longitudinal movement by means of a spacing sleeve 25, engaging the right-hand side of the platen frame 8, and by, a finger-piece 26, having a hub 27 in contact with spacing sleeve 25 and secured to the sleeve 7 by means of a set screw 28. Sleeve 7 is hel against outward movement by means of a hub 29 of a fine-toothed ratchet wheel 30, secured to sleeve 7 by means of a set screw shaft 6.

d be adjusted a fractional by means of said finger-piece 26 to position.

31. Obviously, 30 will effect a rotary shifting of the platen with reference to shaft 6.

Provision is also made for shifting the platen lo 'tudinally with reference to the 0 this end, the I fine-toothed ratchet wheel 30 is for engaging a pro ection 33 on the righthand head 4 of the platen, the platenbeiug yieldably urged toward the cam by means of a helical spring 34, sup rted on a hub 35 projecting to the left from the left-hand platen head 3, and engaging at opposite ends the left-hand head 3 of the platen and the left-hand end of the platen frame 8. It will be seen that the internal gear 15 will move with the platen and that the length of hub 18 must be limited so as to allow the platen to move to the right as far as desired.- Also, since sleeve 7 is held against longitudinal movement, pinion 22.

must be of suflicient length to maintain engagement with the internal gears 15 and 21 during the shifting of the latte According to the present invention, ratchet wheel 30 is actuated by the release mechanism for the usual front and rear feed-rolls 36 and 37, respectively. Said feed-rolls 36 and 37 are carriedspectively, having 41, respectively, in

depending arms 40 and engagement with cam portions of the release shaft 42 supported in brackets 43. Said feed-rolls are normally maintained in engagement with the platen by springs 37.

The usual feed-roll-release finger-piece 44 is pivoted at 45 on the platen frame and connected by means of a link 46 with an arm 47 fixed on shaft 42. In order to actuate the ratchet wheel 30 from the feedroll-release mechanism, a pawl 48 is pivoted at 49 on an ear projecting from link 46, and, when the link is in its downward position, said pawl is maintained in ineffective position by means of a tail 50, forming part thereof, engaging the right-hand bracket 43. Upon actuation of the finger-piece 44, the pawl 48 will be lifted, and, when permitted by tail 50 and bracket 43, will be moved by spring 51 on link 46 into engagement with said ratchet wheel 30.

It will be evident that each time the feedroll-release -mechanism is moved to the dotted-line position, shown in Figure 1, the ratchet wheel 30 will be advanced and the platen shifted a fractional part of a linespace, and also longitudinally either against the opposition of spring 34, by the cam 32 or in the opposite direction, when permitted by said cam.

It will be evident also that the platen may part of a line-space a workheet relatively to the printing point when the feed-rolls are effective.

provided with a cam 32 on levers 38 and 39, re-

' mally connecting with both of said internal gears, said sleeve normally turnin with said shaft, and thereby causing sai platen and said shaft to move together.

12. In a typewriting machine, in combination, a platen, a driving axle therefor, connecting means whereby the platen is norrotated in accordance with the rotation of said axle, feed-rolls yieldabl urged toward said platen, feed-roll cast-o means, and means actuated by said cast-01f means for shifting said connecting means, so as to vary the position of said platen on said axle.

13. In a typewriting machine, in combination, a platen, a driving axle therefor, means normally efi'ective to maintain said platen fixed with respect to said axle, and means to shift said connectmg means to vary the position of said platen on said axle, comprising a ratchetwheel, a pawl for actuating the same, and

manually-operable means for. reciprocating the pawl.

14. In a typewriting machine, in combination, a laten, a driving axle therefor, two gears of t e same diameter, but of different pitch, axle, respwtively, necting means including eslnng with .both. of said gears, normally causing said platen to rotate with said. axle, and

a pinion m means to cause 'midtpinion to roll along said gears, and thereby e ect a relative movement of said platen and said axle, comprising a ratchet-wheel connected with said pinion a connected to platen and drivingto rotate therewith, con-- pawl for actuating said ratchet-wheel, and manually-operable means for reciprocating the pawl.

15. In a typewriting machine, in combinat'on, a platen, a shaft on which said platen is mounted,- feed-rolls yieldably toward said platen, feed-roll cast-oil m anism, includ a finger-lever and a link through which said lever efiects the cast-0E o ration, means to efiect a shifting of said: p aten on saidlshaft, including a ratchetwheel, revolubly mounted on and shaft, means to actuate said ratchet-wheel, including a pawl pivtfied on said link, means urg- 'ing said pawl toward effective position with JOHN WALDHEIM.

Witnesses:

CATHERINE A. Nnwnnn, Jsnnm P. Tnonnn. 

